ngtcp2_conn_read_pkt

Synopsis

#include <ngtcp2/ngtcp2.h>

int ngtcp2_conn_read_pkt(ngtcp2_conn *conn, const ngtcp2_path *path, const ngtcp2_pkt_info *pi, const uint8_t *pkt, size_t pktlen, ngtcp2_tstamp ts)

ngtcp2_conn_read_pkt() decrypts QUIC packet given in pkt of length pktlen and processes it. path is the network path the packet is delivered and must not be NULL. pi is packet metadata and may be NULL. This function performs QUIC handshake as well.

This function must not be called from inside the callback functions.

This function returns 0 if it succeeds, or one of the following negative error codes:

NGTCP2_ERR_RETRY: Server must perform address validation by sending Retry packet (see ngtcp2_crypto_write_retry() and ngtcp2_pkt_write_retry()), and discard the connection state. Client application does not get this error code.
NGTCP2_ERR_DROP_CONN: Server application must drop the connection silently (without sending any CONNECTION_CLOSE frame), and discard connection state. Client application does not get this error code.
NGTCP2_ERR_DRAINING: A connection has entered the draining state, and no further packet transmission is allowed.
NGTCP2_ERR_CLOSING: A connection has entered the closing state, and no further packet transmission is allowed. Calling ngtcp2_conn_write_connection_close() makes a connection enter this state.
NGTCP2_ERR_CRYPTO: An error happened in TLS stack. ngtcp2_conn_get_tls_alert() returns TLS alert if set.

If any other negative error is returned, call ngtcp2_conn_write_connection_close() to get terminal packet, and sending it makes QUIC connection enter the closing state.